I left some 4012 on a desk by a window where it was often exposed to sunlight. After a few weeks it made most paints I used it on seed like crazy. Especially CI. I cut the reducer with water to see if I could save it. Ended up adding maybe 25 percent back to it in water before the seeding problem stopped. The bottle was closed but not super tight so idk if this was evaporation or just an effect of UV exposure. Anyhow point is this can happen, and it can be fixed w water.